Battery control apparatus and method

ABSTRACT

A battery control apparatus includes an emergency charging unit including an external charging terminal for applying power to a main battery pack, a first voltage measurement unit for measuring the voltage of the external charging terminal, and an emergency charging switch for switching the connection between the external charging terminal and the main battery pack; an auxiliary battery connection unit including an auxiliary battery connection terminal for applying power to the vehicle through a contactor, a second voltage measurement unit for measuring the voltage of the auxiliary battery connection terminal, and an auxiliary battery switch for switching the connection between the auxiliary battery connection terminal and the contactor; and an emergency control unit for switching to an emergency charging mode or an auxiliary connection mode by turning on the emergency charging switch or the auxiliary battery switch during the voltage measurement of the first or second voltage measurement unit.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of International Application No.PCT/KR2011/000091 filed on Jan. 6, 2011, which claims priority under 35USC 119(a) to Korean Patent Application No. 10-2010-0000928 filed in theRepublic of Korea on Jan. 6, 2010 and Korean Patent Application No.10-2011-0001467 filed in the Republic of Korea on Jan. 6, 2011, theentire contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a technique for controlling a batterypack, and more particularly, to a method and apparatus for controlling avehicle battery pack connected to an external power supply unit in anemergency when the battery pack is fully discharged.

BACKGROUND ART

Recently, as the demand for portable electronic products such asnotebooks, video cameras, mobile phones, etc. are rapidly increasing, soare the development of energy storage batteries, robots, satellites,etc., which is leading to the extensive research on high-performancesecondary batteries capable of repeated charge and discharge.

Commercially available secondary batteries at present includenickel-cadmium batteries, nickel-hydrogen batteries, nickel-zincbatteries, lithium secondary batteries, etc. Among them, the lithiumsecondary batteries are less susceptible to memory effect compared tonickel-based secondary batteries and thus can be freely charged anddischarged. Moreover, the lithium secondary batteries are attractingmuch attention for its very low self-discharge rate and high energydensity.

In particular, with the recent increase in the interest in theenvironment where carbon energy is being depleted,environmentally-friendly vehicles such as hybrid vehicles, electricvehicles, etc. have attracted much attention all over the world,including USA, Europe, Japan, and Korea. In such a hybrid vehicle orelectric vehicle, the most critical component is a battery, for itprovides a driving force to a vehicle motor. The hybrid vehicle orelectric vehicle are powered by the charge and discharge of the battery,and thus have high fuel efficiency and do not emit pollutants comparedto conventional vehicles powered by internal combustion engines. As aresult, the number of users of such vehicles is significantlyincreasing.

In the case of the battery that is used in such a hybrid vehicle orelectric vehicle, the battery's state-of-charge (SOC) may be reduced tothe lower limit during operation of the vehicle, by the naturalconsumption of the battery, or by a power leakage from the vehicleduring stopping of the vehicle. The battery's state-of-charge reduced tothe lower limit refers to a fully discharged state. At this time, nopower is supplied from the battery, and thus the operation of theelectric vehicle or devices powered by the battery is severely limited.

Under normal circumstances, when the battery is fully discharged orapproaches the fully discharged state, the battery is charged in abattery charging station or by using a battery charger. However, whenthe vehicle battery is in the fully discharged state in a situationwhere the vehicle is not located in the battery charging station, thevehicle will not operate, making it necessary to provide emergencycharging to the battery. In such a situation, the emergency charging maybe provided by an emergency vehicle or another vehicle, otherwise, anemergency battery may be used instead of the fully discharged battery tomove to the station.

As such, a vehicle battery provided with an auxiliary charging terminalto have an emergency charging function, a vehicle battery provided witha space for mounting an auxiliary battery, etc. have been developed toprepare for emergencies. Furthermore, a battery with both the emergencycharging function and the auxiliary battery mounting function can be avery useful unit for responding to emergencies.

However, in the case of the battery with both the emergency chargingfunction and the auxiliary battery mounting function, there is a lack ofresearch on how to control the battery for each situation. Moreover,vehicle batteries of recent years are provided with a complex controlsystem and various safety units. Therefore, when the emergency chargingfunction and the auxiliary battery mounting function are simply added tothe battery, a battery control apparat8s cannot effectively control thebattery, and thus the battery itself may have serious safety problems.

DISCLOSURE Technical Problem

The present disclosure is designed to solve the problems of the priorart, and therefore it is an object of the present disclosure to providea battery control apparatus which can automatically detect the use of anemergency charging function and an auxiliary battery mounting functionprovided in a battery pack in the event of an emergency, therebycontrolling the battery pack based on the corresponding function.

Other objects and advantages of the present disclosure will beunderstood by the following description and become more apparent fromthe embodiments of the present disclosure, which are set forth herein.It will be also apparent that objects and advantages of the presentdisclosure can be embodied easily by the components defined in claimsand combinations thereof.

Technical Solution

In order to accomplish the above object, there is provided a batterycontrol apparatus provided in a vehicle battery pack, for controllingthe battery pack, which can be charged in an emergency and equipped withan auxiliary battery, the battery control apparatus including: anemergency charging unit including an external charging terminal forapplying power to a main battery pack, a first voltage measurement unitfor measuring the voltage of the external charging terminal, and anemergency charging switch for switching the connection between theexternal charging terminal and the main battery pack; an auxiliarybattery connection unit including an auxiliary battery connectionterminal for applying power to the vehicle through a contactor, a secondvoltage measurement unit for measuring the voltage of the auxiliarybattery connection terminal, and an auxiliary battery switch forswitching the connection between the auxiliary battery connectionterminal and the contactor; and an emergency control unit for switchingto an emergency charging mode by turning on the emergency chargingswitch during the voltage measurement of the first voltage measurementunit and switching to an auxiliary connection mode by turning on theauxiliary battery switch during the voltage measurement of the secondvoltage measurement unit.

In addition, in another aspect, a battery management system according tothe present disclosure includes the above battery control apparatus.

In addition, in another aspect, a vehicle according to the presentdisclosure includes the above battery control apparatus.

In addition, in another aspect, there is also provided a vehicle batterypack with a control function, which can be charged in an emergency andequipped with an auxiliary battery, the battery pack including: a mainbattery pack including at least one battery cell; a battery managementsystem for measuring a cell voltage of the main battery pack andcontrolling the main battery pack; a charge/discharge control switch forswitching charge/discharge power of the main battery pack under thecontrol of the battery management system; an emergency charging moduleprovided with an external charging terminal connected to the mainbattery pack and applying charging power directly to the main batterypack; an auxiliary battery connection module provided with an auxiliarybattery connection terminal connected to a contactor of a main powerline and applying power directly to the vehicle; and an emergencycontrol module for switching to an emergency charging mode when avoltage is detected from the external charging terminal of the emergencycharging module and switching to an auxiliary connection mode when avoltage is detected from the auxiliary battery connection terminal ofthe auxiliary battery connection module.

In addition, in another aspect of the present invention, there is alsoprovided a battery control method for controlling a battery in anemergency and implemented in a battery control apparatus provided in avehicle battery pack, which can be charged in an emergency and equippedwith an auxiliary battery, the battery control method including: (a)determining whether a voltage is applied to an external chargingterminal connected to a main battery pack and applying charging power tothe main battery pack and an auxiliary battery connection terminalconnected to a contactor and applying power to the vehicle; (b)switching to an emergency charging mode, when the voltage is applied tothe external charging terminal, and charging the main battery pack withthe power supplied through the external charging terminal; and (c)switching to an auxiliary battery connection mode, when the voltage isapplied to the auxiliary battery connection terminal, and supplyingpower from the connected auxiliary battery to the vehicle through themain power line.

Advantageous Effects

According to the present disclosure, during emergency charging of thevehicle battery pack or during mounting of the auxiliary battery, theemergency control system of the battery pack automatically detects thesituation such that, during the emergency charging, the main power ofthe battery is cut off and the battery is charged and, during themounting of the auxiliary battery, the charging line to the battery iscut off and the power of the auxiliary battery is supplied only to thevehicle, thereby safely controlling the battery pack when variousattempts are made to handle emergencies.

Accordingly, even when various attempts are made to handle emergencies,no strain is placed on the battery itself, which reduces the occurrenceof failures, thereby preventing malfunctions in the battery.

DESCRIPTION OF DRAWINGS

Other objects and aspects of the present disclosure will become apparentfrom the following descriptions of the embodiments with reference to theaccompanying drawings in which:

FIG. 1 is a diagram showing the main configuration of a battery packwith a control function in accordance with a preferred embodiment of thepresent disclosure;

FIG. 2 is a circuit diagram showing the main circuit configuration of abattery pack with a control function in accordance with a preferredembodiment of the present disclosure;

FIG. 3 is a flowchart showing the process of a battery control method inaccordance with a preferred embodiment of the present disclosure;

FIG. 4 is a flowchart showing a control process performed in a batterypack in an emergency charging mode of a battery control method inaccordance with a preferred embodiment of the present disclosure; and

FIG. 5 is a flowchart showing a control process performed in a batterypack in an auxiliary battery connection mode of a battery control methodin accordance with a preferred embodiment of the present disclosure.

BEST MODE

Hereinafter, preferred embodiments of the present disclosure will bedescribed in detail with reference to the accompanying drawings. Priorto the description, it should be understood that the terms used in thespecification and the appended claims should not be construed as limitedto general and dictionary meanings, but interpreted based on themeanings and concepts corresponding to technical aspects of the presentdisclosure on the basis of the principle that the inventor is allowed todefine terms appropriately for the best explanation. Therefore, thedescription proposed herein is just a preferable example for the purposeof illustrations only, not intended to limit the scope of thedisclosure, so it should be understood that other equivalents andmodifications could be made thereto without departing from the spiritand scope of the disclosure.

FIG. 1 is a diagram showing the main configuration of a battery packwith a control function in accordance with a preferred embodiment of thepresent disclosure.

Referring to FIG. 1, a battery pack with a control function inaccordance with a preferred embodiment of the present disclosurecomprises a main battery pack 210, a charge/discharge control switch220, a main charging terminal 230, a battery management system (BMS)250, a pack housing (not shown), an emergency charging module 110, anauxiliary battery connection module 120, and an emergency control module150.

The main battery pack 210 has a structure in which a plurality ofbattery cells are connected together and each battery cell serves tocharge and discharge electric energy. The battery cells of the mainbattery pack 210 are connected together in series to meet the voltagecapacity required for an electric device powered by the battery pack.Moreover, the main battery pack 210 is connected to a vehicle powerinput terminal 310 of a vehicle to supply the charged power to thevehicle. Furthermore, the main battery pack 210 is equipped with a unitfor measuring voltage, temperature, and other status information, andthe measured information is transmitted to the battery management system250, which will be described later.

The charge/discharge control switch 220 serves to prevent overcharge andoverdischarge of the main battery pack 210. The charge/discharge controlswitch 220 is turned on and off by the control of the battery managementsystem 250, which will be described later, and includes a C_FETtransistor for preventing overcharge and a D_FET transistor forpreventing overdischarge. Moreover, the charge/discharge control switch220 is provided on a main power supply line L between the main batterypack 210 and the vehicle power input terminal 310.

The main charging terminal 230 is a power input terminal for applyingcharging power to the main battery pack 210 under the control of thebattery management system 250, which will be described later.

The battery management system 250 serves to measure the status of thebattery cells in the main battery pack 210, such as voltage,temperature, etc., and to control and manage the main battery pack 210and the entire battery based on the measured information. In particular,the battery management system 250 serves to control the charge/dischargecontrol switch 220 so as to prevent overcharge and overdischarge andprevent the flow of overcurrent based on the status of the main batterypack 210. Moreover, the battery management system 250 serves to transmitthe status information of the main battery pack 210 and variousinformation of the entire battery to a vehicle computing system 350mounted in the vehicle.

The emergency charging module 110 is provided with an external chargingterminal connected to the main battery pack 210 to receive chargingpower directly from the outside in the event of an emergency, therebycharging the main battery pack 210. The emergency charging module 110 isprovided with the external charging terminal which can be used in anemergency, separately from the main charging terminal 230. That is,while the main charging terminal 230 is connected to a terminal of apredetermined standard provided in a battery charging station to performcharging, the external charging terminal provided in the emergencycharging module 110 is designed to temporarily charge the battery in anemergency.

In more detail, the emergency charging module 110 includes the externalcharging terminal connected to the main battery pack, a first voltagemeasurement unit for measuring the voltage of the external chargingterminal, and an emergency charging switch for switching the connectionbetween the external charging terminal and the main battery pack. Thefirst voltage measurement unit serves to measure the voltage of theexternal charging terminal and to transmit the measured voltage value tothe emergency control module 150, which will be described later, therebydetermining whether emergency charging is performed through the externalcharging terminal.

Moreover, the emergency charging switch serves to switch an electricalconnection between the external charging terminal and the main batterypack 210. The emergency charging switch is turned on and off by thecontrol of the emergency control module 150, which will be describedlater. That is, in a normal state, the emergency charging switch cutsoff the electrical connection between the external charging terminal ofthe emergency charging module 110 and the main battery pack 210 and,when the emergency charging is performed through the external chargingterminal, electrically connects a line to the main battery pack 210under the control of the emergency control module 150, which will bedescribed later.

The auxiliary battery connection module 120 is provided with anauxiliary battery connection terminal connected to a contactor of themain power line L connected from the main battery pack 210 to thevehicle power input terminal to connect to an auxiliary battery in anemergency, thereby directly supplying power to the vehicle. Theauxiliary battery connection module 120 includes the auxiliary batteryconnection terminal, a second voltage measurement unit, and an auxiliarybattery switch. The auxiliary battery connection terminal is connectedto the contactor of the main power line L and includes a connectorelectrically connected to a power output terminal of the auxiliarybattery mounted externally. Like the first voltage measurement unit, thesecond voltage measurement unit serves to measure the voltage of theauxiliary battery connection terminal and to transmit the measuredvoltage value to the emergency control module 150, which will bedescribed later, thereby determining whether the power from theauxiliary battery is supplied through the auxiliary battery connectionterminal.

Moreover, the auxiliary battery switch serves to switch an electricalconnection between the auxiliary battery connection terminal and themain power line L. The auxiliary battery switch is turned on and off bythe control of the emergency control module 150, which will be describedlater. That is, in a normal state, the auxiliary battery switch cuts offthe electrical connection between the auxiliary battery connectionterminal of the auxiliary battery connection module 120 and thecontactor and, when the power from the auxiliary battery is suppliedthrough the auxiliary battery connection module 120, electricallyconnects a line to the contactor under the control of the emergencycontrol module 150, which will now be described below.

The emergency control module 150 may be included in the batterymanagement system 250 and serves to control the emergency chargingmodule 110 and the auxiliary battery connection module 120, therebycontrolling the battery in an emergency. The emergency control module150 determines whether the voltage is detected from the emergencycharging module 110 and the auxiliary battery connection module 120,thereby automatically detecting whether the emergency charging isperformed by the emergency charging module 110 or whether the auxiliarybattery is mounted to supply power.

When an emergency unit from the outside is detected in the above manner,the battery pack switches to an emergency mode. First, when the voltageis detected by the first voltage measurement unit of the emergencycharging module 110, the emergency control module 150 determines thatthe emergency charging power is applied through the external chargingterminal, then switches to an emergency charging mode, and turns on theemergency charging switch of the emergency charging module 110 to supplypower to the main battery pack 210, thereby performing the chargingoperation. Moreover, the emergency control module 150 turns off thecharge/discharge control switch 220 such that the power is not suppliedto the vehicle during the charging operation.

Furthermore, when the main battery pack is being charged in theemergency charging mode, the emergency control module 150 measures thevoltage of the main battery pack and maintains the charging operationuntil the charging voltage reaches a predetermined reference value. Ifthe charging voltage reaches the predetermined reference value, theemergency control module 150 turns off the emergency charging switch ofthe emergency charging module 110 to cut off the power of the externalcharging terminal, thereby stopping the emergency charging operation.

When the voltage is detected by the second voltage measurement unit ofthe auxiliary battery connection module 120, the emergency controlmodule 150 determines that the auxiliary power is supplied from theauxiliary battery to the vehicle through the auxiliary batteryconnection terminal, then switches to an auxiliary battery connectionmode, and turns on the auxiliary battery switch of the auxiliary batteryconnection module 120, thereby supplying power to the vehicle throughthe main power line L. Moreover, the emergency control module 150 turnsoff the charge/discharge control switch 220 such that the auxiliarypower is not supplied to the main battery pack 210 while the auxiliarypower is being supplied to vehicle.

When the power is being supplied from the auxiliary battery to thevehicle in the auxiliary battery connection mode, the emergency controlmodule 150 measures the voltage of the auxiliary battery connected bythe auxiliary battery connection module 120, calculates astate-of-charge (SOC) of the auxiliary battery based on the measuredvoltage value, and transmits the calculated SOC to the vehicle computingsystem 350.

Moreover, when switching to the emergency charging mode or the auxiliarybattery connection mode, the emergency control module 150 transmits modeswitching information to the vehicle computing system 350 such that auser of the vehicle can identify the mode in which the battery pack ofthe vehicle is operating.

Although not shown in the figures, the pack housing is an externalhousing for accommodating an assembly of the main battery pack 210, thecharge/discharge control switch 220, the main charging terminal 230, thebattery management system 250, the emergency charging module 110, theauxiliary battery connection module 120, and the emergency controlmodule 150.

FIG. 2 is a circuit diagram showing the main circuit configuration of abattery pack with a control function in accordance with a preferredembodiment of the present disclosure.

The circuit operation of the battery pack with a control function andthat of the battery control apparatus in accordance with a preferredembodiment of the present disclosure will be described in detail withreference to FIG. 2.

Referring to FIG. 2, in the internal circuit of the battery packaccording to the present disclosure, a high potential line Pack+and alow potential line Pack−are disposed at both ends of the main batterypack 210, respectively. The high potential line and the low potentialline are connected to the vehicle power input terminal disposed,respectively. Moreover, the charge/discharge control switch 220including the C_FET transistor and the D_FET transistor is disposed onthe high potential line or the low potential line and connected to thebattery management system 250 (hereinafter referred to as a controller)including the emergency control module 150 to be turned on and off.

Further, the emergency charging module 110 is connected to both ends ofthe high potential line and the low potential line around the mainbattery pack 210. The emergency charging module 110 is provided with anexternal charging terminal 115, and an emergency charging switch ES isprovided on a connection portion of the high potential line and aconnection portion of the low potential line, respectively.

The auxiliary battery connection module 120 is electrically connected tothe contactor disposed between the charge/discharge control switch 220and the vehicle power input terminal 310 on the high potential line andthe low potential line. The auxiliary battery connection module 120 isprovided with an auxiliary battery connection terminal 125, and anauxiliary battery switch SS is provided on a connection portion of thehigh potential line and a connection portion of the low potential line,respectively.

The main battery pack 210, the emergency charging module 110, and theauxiliary battery connection module 120 include a main battery packvoltage measurement unit S, a first voltage measurement unit S1, asecond voltage measurement unit S2, respectively, which are connected tothe controller 250 to measure voltage Vc of the main battery pack,voltage V1 of the external charging terminal, and voltage V2 of theauxiliary battery connection terminal.

The controller 250 is connected to a communication port (COM port) ofthe vehicle computing system to transmit various signals and informationdata to the vehicle.

The circuit operation during which the emergency control is performed bythe controller 250 in the configured circuit will be described below.

First, a case where the emergency charging operation is performed by theemergency charging module 110 will be described below. External chargingpower is connected to the external charging terminal 115, and the firstvoltage measurement unit S1 measures the voltage applied to the externalcharging terminal 115 and transmits the measured voltage value to thecontroller 250. The controller 250 determines based on the measuredvoltage value that the emergency charging operation is being performed,switches to the emergency charging mode, turns on the emergency chargingswitch ES, and turns off the charge/discharge control switch 220.

Then, the charging power supplied through the external charging terminal115 is applied to the main battery pack 210 through the emergencycharging switch ES, thereby charging the main battery pack 210. Thepower supply to the vehicle power input terminal is cut off by theclosing of the charge/discharge control switch 220. Moreover, thecontroller 250 measures the power of the main battery pack 210 throughthe main battery pack power measurement unit S. If the power reaches apredetermined reference value, the controller 250 determines that theemergency charging operation is completed and turns off the emergencycharging switch, thereby stopping the emergency charging operation. Uponcompletion of the emergency charging operation, the controller 250 turnson the charge/discharge control switch 220 to supply the power of themain battery pack 210 to the vehicle power input terminal.

Next, a case where the power from the auxiliary battery is suppliedthrough the auxiliary battery connection module 120 will be describedbelow. In this case, the external auxiliary battery is electricallyconnected to the auxiliary battery connection terminal 125, and thesecond voltage measurement unit S2 measures the voltage applied to theauxiliary battery connection terminal 125 and transmits the measuredvoltage value to the controller 250. The controller 250 determines basedon the measured voltage value that the power from the auxiliary batteryis being supplied, switches to the auxiliary battery connection mode,turns on the auxiliary battery switch SS, and turns off thecharge/discharge control switch 220.

By the control process, the high potential line and the low potentialline connected to the main battery pack 210 are cut off by the openingof the charge/discharge control switch 220, and the auxiliary batteryconnection terminal 125 and the contactor of the high potential linePack+and the low potential line Pack−are connected together by theclosing of the auxiliary battery switch SS. Therefore, the auxiliarybattery connection terminal 125 is being electrically connected to thevehicle power input terminal 310 and disconnected to the main batterypack 210. In this case, the power of the auxiliary battery applied fromthe auxiliary battery connection terminal 125 is supplied only to thevehicle power input terminal 310, not to the main battery pack 210.

At the same time when the power is supplied to the vehicle according tothe auxiliary battery connection mode, the controller 250 measures thevoltage of the auxiliary battery through the second voltage measurementunit S2 and calculates the state-of-charge of the auxiliary battery. Assuch, in the auxiliary battery connection mode, the controller 250calculates the state-of-charge of the auxiliary battery and transmitsthe measured value to the vehicle computing system through acommunication line.

Here, the method of calculating the state-of-charge of the battery usesa function having three variables such as voltage, temperature, andresistance of the battery. This method of calculating thestate-of-charge of the battery is known in the art, and thus a detaileddescription thereof will be omitted.

However, in the case where the auxiliary battery is connected, only thevoltage of the auxiliary battery measured by the second voltagemeasurement unit S2 provided in the auxiliary battery connection module120 can be used, and thus the commonly know method cannot be used tocalculate the state-of-charge of the auxiliary battery. Therefore, inthe present disclosure, the state-of-charge of the auxiliary battery iscalculated only based on the measured voltage value of the auxiliarybattery. Here, the voltage is set to 100% when the auxiliary battery isfully charged and thus can be used for the vehicle, and the voltage isset to 0% when the auxiliary battery is fully discharged and thus cannotbe used for the vehicle such that the measured voltage value of theauxiliary battery is converted into a percentage based on the ratio,thereby calculating the state-of charge of the auxiliary battery.

Alternatively, in the case where an SOC calculation module is mounted inthe auxiliary battery itself, the controller 250 may receive calculatedSOC information from the auxiliary battery and transmit the SOCinformation to the vehicle computing system.

Moreover, when transmitting various information to the vehicle computingsystem, the controller 250 may use a vehicle communication protocol suchas CAN communication. Moreover, the information transmitted from thecontroller 250 through the communication port of the vehicle computingsystem may further include emergency mode switching status information.That is, mode status information, which indicates whether the currentmode is the emergency charging mode or the auxiliary battery connectionmode, may be transmitted to the user of the vehicle to identify thecorresponding status.

The controller 250 performing the above-described operations may beconfigured as a microprocessor capable of executing a code obtained byprogramming the battery control method according to the presentdisclosure or as a semiconductor chip obtained by implementing thecontrol flow of the battery control method according to the presentdisclosure as a logic circuit, but the present disclosure is not limitedthereto.

Meanwhile, the above-described battery control method according to thepresent disclosure may be used in combination with the batterymanagement system 250 for managing the battery pack.

Moreover, the present disclosure may be used in combination with variouspower systems such as fossil fuel vehicles, electric vehicles, hybridvehicles, electric bicycles, etc.

Further, it will be apparent to those having ordinary skill in the artthat the battery control method according to the present disclosure maybe modularized into a PCB circuit or an application-specific integratedcircuit (ASIC) and mounted in the battery pack.

FIG. 3 is a flowchart showing the process of a battery control method inaccordance with a preferred embodiment of the present disclosure.

Referring to FIG. 3, according to the battery control method of thepresent disclosure, a process of checking voltage measurement unitsprovided in various emergency handling unit is performed. That is, theprocess is a monitoring process to monitor measured values received fromvoltage measurement units provided in an emergency charging unit, anauxiliary battery connection unit, etc. (S10)

Next, during the monitoring of the voltage measurement units, a processof determining whether the value of V1, which is the voltage measured bythe first voltage measurement unit S1 provided in the emergency chargingunit, is above 0 V is performed. That is, when a voltage above 0 V isapplied to the external charging terminal of the emergency chargingunit, the emergency charging unit is being electrically connected to theexternal charging terminal from the outside. On the contrary, when avoltage of 0 V is applied to the external charging terminal of theemergency charging unit, no electrical connection is being made from theoutside (S20).

Therefore, when a voltage above 0 V is measured by the first voltagemeasurement unit, it is determined that the emergency charging is beingprovided from the outside, and the controller switches to the emergencycharging mode for performing the emergency charging operation on thebattery pack. When switching to the emergency charging mode, thecontroller applies power from the emergency charging unit to the mainbattery pack to perform the charging operation and cuts off the mainpower line through which power is supplied from the main battery pack tothe vehicle (S40).

On the contrary, when a voltage of 0 V is measured by the first voltagemeasurement unit, it is determined that the emergency charging is notbeing provided from the outside, and a process of determining whetherthe value of V2, which is the voltage measured by the second voltagemeasurement unit S2 provided in the auxiliary battery connection unit,is above 0 V is performed. That is, when a voltage above 0 V is appliedto the auxiliary battery connection terminal of the auxiliary batteryconnection unit, the auxiliary battery is being mounted externally toapply power to the auxiliary battery connection terminal. However, whena voltage of 0 V is applied to the auxiliary battery connection terminalof the auxiliary battery connection unit, the auxiliary battery is notbeing connected externally (S30).

In the above step, when a voltage above 0 V is measured by the secondvoltage measurement unit S2, it is determined that the auxiliary batteryis being mounted externally, and the controller switches to theauxiliary battery connection mode in which the power of the auxiliarybattery is supplied to the vehicle to operate in an emergency. Whenswitching to the auxiliary battery connection mode, the controllerapplies power from the auxiliary battery to the main power lineconnected to the vehicle to supply emergency power to the vehicle andcuts off the main battery line to prevent the power from being appliedto the main battery pack (S60).

Moreover, when the voltage measured in the above steps S20 and S30 isall 0 V, it is determined that no connection is being made to theemergency charging unit and the auxiliary battery connection unit, andthe controller maintains a normal mode. That is, the power is suppliedfrom the main battery pack to the vehicle (S50).

FIG. 4 is a flowchart showing a control process performed in a batterypack in an emergency charging mode of a battery control method inaccordance with a preferred embodiment of the present disclosure.

Referring to FIG. 4, when a voltage above 0 V is measured by theemergency charging module, the controller switches to the emergencycharging mode (S41).

When switching to the emergency charging mode, the controller transmitsinformation indicating the mode switching to the vehicle computingsystem. At this time, the controller transmits emergency charging modeswitching information to the vehicle computing system through thecommunication port of the vehicle based on the vehicle communicationprotocol. Thus, a user of the vehicle can receive a notificationindicating the emergency charging mode displayed on the vehiclecomputing system and thus can recognize that the emergency chargingoperation is performed (S42).

Next, the controller turns off the charge/discharge control switchprovided between the main battery pack and vehicle power input terminal.Thus, the emergency charging power is not applied to the vehicle powerinput terminal during the emergency charging operation (S43).

Moreover, the controller turns on the emergency charging switch providedbetween the main battery pack and the external charging terminal of theemergency charging module. Thus, the charging power supplied from theexternal charging unit can be transmitted to the main battery pack(S44).

As such, when the charging power is applied from the external chargingunit to the main battery pack, the main battery pack is charged (S45).

The controller measures a charging voltage Vc through the voltagemeasurement unit S provided in the main battery pack during the chargingoperation of the main battery pack (S46).

At this time, the controller determines whether the charging voltage Vcreaches or exceeds a predetermined reference value. Here, if thecharging voltage Vc does not reach the predetermined reference value,the controller maintains the charging operation of step S45 (S47).

On the contrary, if the charging voltage Vc reaches or exceeds thepredetermined reference value, the controller determines that the mainbattery pack is fully charged and turns off the emergency chargingswitch provided in the emergency charging module such that the chargingpower supply from the external charging unit is cut off (S48).

Moreover, the controller transmits emergency charging completioninformation to the vehicle computing system. Thus, the emergencycharging completion information is displayed on the vehicle, and thusthe user can recognize the completion of the emergency charging. Here,the vehicle computing system can display the emergency chargingcompletion to the user by voice or message (S49).

FIG. 5 is a flowchart showing a control process performed in a batterypack in an auxiliary battery connection mode of a battery control methodin accordance with a preferred embodiment of the present disclosure.

A control process performed by the battery management system in anauxiliary battery connection mode will be described with reference toFIG. 5.

First, when the second voltage measurement unit provided in theauxiliary battery connection unit measures a voltage above 0 V appliedto the auxiliary battery connection terminal, the controller determinesthat the auxiliary battery is being connected externally and switches tothe auxiliary battery connection mode (S61).

When switching to the auxiliary battery connection mode, the controllertransmits information indicating the mode switching to the vehiclecomputing system. At this time, the controller transmits auxiliarybattery connection mode switching information to the vehicle computingsystem through the communication port of the vehicle based on thevehicle communication protocol. Thus, the user of the vehicle canreceive a notification indicating the auxiliary battery connection modedisplayed on the vehicle computing system and thus can recognize thatthe power of the auxiliary battery is supplied to the vehicle (S62).

Next, the controller turns off the charge/discharge control switchprovided between the main battery line and the main battery pack. Thus,the power of the auxiliary battery is not applied to the main batterypack during the power supply from the auxiliary battery (S63).

Moreover, the controller turns on the auxiliary battery switch providedbetween the main battery line connected to the vehicle power inputterminal and the auxiliary battery connection terminal of the auxiliarybattery module. As such, when the auxiliary switch is turned on, theauxiliary power supplied from the auxiliary battery is applied to themain power line through the contactor and then applied to the vehiclepower input terminal connected to the main power line. At this time,since the connection line from the main power line to the main batterypack is cut off in the above step S63, the power supplied from theauxiliary battery is applied only to the vehicle, not to the mainbattery pack (S64).

As such, when the auxiliary power is applied from the auxiliary batteryto the vehicle power input terminal, the auxiliary power is supplied toa vehicle driving device and devices that require power, not to the mainbattery pack, thereby driving the vehicle and operating the devices(S65).

Thereafter, the controller measures the voltage V2 of the auxiliarybattery through the second voltage measurement unit S2 provided in theauxiliary battery connection unit when the auxiliary power is beingsupplied to the vehicle (S66).

When the voltage of the auxiliary battery is measured, the controllercalculates the current state-of-charge of the auxiliary battery based onthe measured voltage (S67). The configuration of calculating thestate-of-charge of the auxiliary battery based on the measured voltagehas been described above, and thus a repeated description thereof willbe omitted.

When the state-of-charge of the auxiliary battery is calculated, thecontroller transmits the calculated SOC information to the vehiclecomputing system. Thus, the user of the vehicle can receive the SOCinformation of the auxiliary battery and determine how long the vehiclewill be able to travel with the auxiliary power supplied from theauxiliary battery (S68).

The present disclosure has been described in detail. However, it shouldbe understood that the detailed description and specific examples, whileindicating preferred embodiments of the disclosure, are given by way ofillustration only, since various changes and modifications within thespirit and scope of the disclosure will become apparent to those skilledin the art from this detailed description.

What is claimed is:
 1. A battery control apparatus provided in a vehiclebattery pack, for controlling the battery pack, which can be charged inan emergency and equipped with an auxiliary battery, the battery controlapparatus comprising: an emergency charging unit including an externalcharging terminal for applying power to a main battery pack, a firstvoltage measurement unit for measuring the voltage of the externalcharging terminal, and an emergency charging switch for switching theconnection between the external charging terminal and the main batterypack; an auxiliary battery connection unit including an auxiliarybattery connection terminal for applying power to the vehicle through acontactor, a second voltage measurement unit for measuring the voltageof the auxiliary battery connection terminal, and an auxiliary batteryswitch for switching the connection between the auxiliary batteryconnection terminal and the contactor; and an emergency control unit forswitching to an emergency charging mode by turning on the emergencycharging switch during the voltage measurement of the first voltagemeasurement unit and switching to an auxiliary connection mode byturning on the auxiliary battery switch during the voltage measurementof the second voltage measurement unit.
 2. The battery control apparatusof claim 1, wherein the emergency control unit turns off acharge/discharge control switch connected to the main battery pack whenswitching to the emergency charging mode or the auxiliary batteryconnection mode.
 3. The battery control apparatus of claim 1, whereinthe emergency control unit detects the voltage of the main battery packwhen switching to the emergency charging mode and turns off theemergency charging switch, if the charging voltage reaches apredetermined reference value.
 4. The battery control apparatus of claim3, wherein when the emergency charging switch is turned off uponcompletion of emergency charging, the emergency control unit transmits anotification signal indicating the completion of the emergency chargingto a vehicle computing system.
 5. The battery control apparatus of claim1, wherein when switching to the auxiliary battery connection mode, theemergency control unit measures the voltage of the connected auxiliarybattery through the second voltage measurement unit, calculatesstate-of-charge information of the auxiliary battery, and transmits theinformation to a vehicle computing system.
 6. The battery controlapparatus of claim 1, wherein when switching to the auxiliary batteryconnection mode, the auxiliary control unit receives state-of-chargeinformation from the connected auxiliary battery and transmits theinformation to a vehicle computing system.
 7. The battery controlapparatus of claim 1, wherein when switching to the emergency chargingmode or the auxiliary battery connection mode, the emergency controlunit transmits mode switching information to a vehicle computing system.8. A battery management system comprising the battery control apparatusof claim
 1. 9. A vehicle comprising the battery control apparatus ofclaim
 1. 10. A vehicle battery pack with a control function, which canbe charged in an emergency and equipped with an auxiliary battery, thebattery pack comprising: a main battery pack including at least onebattery cell; a battery management system for measuring a cell voltageof the main battery pack and controlling the main battery pack; acharge/discharge control switch for switching charge/discharge power ofthe main battery pack under the control of the battery managementsystem; an emergency charging module provided with an external chargingterminal connected to the main battery pack and applying charging powerdirectly to the main battery pack; an auxiliary battery connectionmodule provided with an auxiliary battery connection terminal connectedto a contactor of a main power line and applying power directly to thevehicle; and an emergency control module for switching to an emergencycharging mode when a voltage is detected from the external chargingterminal of the emergency charging module and switching to an auxiliaryconnection mode when a voltage is detected from the auxiliary batteryconnection terminal of the auxiliary battery connection module.
 11. Thebattery pack of claim 10, wherein when switching to the emergencycharging mode or the auxiliary battery connection mode, the emergencycontrol module turns off the charge/discharge control switch.
 12. Thebattery pack of claim 11, wherein the charge/discharge control switch islocated on the main power line connected between the main battery packand a vehicle power input terminal.
 13. The battery pack of claim 12,wherein the auxiliary battery connection terminal of the auxiliarybattery connection module is connected to the contactor located on themain power line between the charge/discharge control switch and thevehicle power input terminal.
 14. The battery pack of claim 10, furthercomprising: a main charging terminal for applying charging power to themain battery pack under the control of the battery management system;and a pack housing for accommodating an assembly of the main batterypack, the battery management system, the charge/discharge controlswitch, the emergency charging module, the auxiliary battery connectionmodule, the emergency control module, and the main charging terminal.15. A battery control method controlling a battery in an emergency andimplemented in a battery control apparatus provided in a vehicle batterypack, which can be charged in an emergency and equipped with anauxiliary battery, the battery control method comprising the steps of:(a) determining whether a voltage is applied to an external chargingterminal connected to a main battery pack and applying charging power tothe main battery pack and an auxiliary battery connection terminalconnected to a contactor and applying power to the vehicle; (b)switching to an emergency charging mode, when the voltage is applied tothe external charging terminal, and charging the main battery pack withthe power supplied through the external charging terminal; and (c)switching to an auxiliary battery connection mode, when the voltage isapplied to the auxiliary battery connection terminal, and supplyingpower from the connected auxiliary battery to the vehicle through themain power line.
 16. The battery control method of claim 15, wherein instep (b) or step (c), mode switching information is transmitted to avehicle computing system when switching to the emergency charging modeor the auxiliary battery connection mode.
 17. The battery control methodof claim 15, wherein step (b) comprises the steps of: (a) switching tothe emergency charging mode, when the voltage is applied to the externalcharging terminal, and turning off a charge/discharge control switch ofthe main battery pack; (2) turning on an emergency charging switchconnected to the external charging terminal and supplying charging powerto the main battery pack; (3) measuring the charging voltage of the mainbattery pack and maintaining the charging operation until the chargingvoltage reaches a predetermined reference value; and (4) turning off theemergency charging switch, if the charging voltage of the main batterypack reaches the predetermined reference value, and completing theemergency charging.
 18. The battery control method of claim 17, whereinafter step (4), emergency charging completion information is transmittedto a vehicle computing system.
 19. The battery control method of claim15, wherein step (c) comprises the steps of: (5) switching to theauxiliary battery connection mode, when the voltage is applied to theauxiliary battery connection terminal, and turning off thecharge/discharge control switch of the main battery pack; and (6)turning on the auxiliary battery switch connected to the auxiliarybattery connection terminal and supplying the power from the connectedauxiliary battery to the vehicle through the main power line.
 20. Thebattery control method of claim 19, further comprising, after step (6),the steps of: (7) measuring the voltage of the auxiliary battery andcalculating a state-of-charge of the auxiliary battery; and (8)transmitting the calculated state-of-charge of the auxiliary battery toa vehicle computing system.
 21. The battery control method of claim 19,further comprising, after step (6), the steps of: (9) receivingstate-of-charge information from the auxiliary battery; and (10)transmitting the received state-of-charge information of the auxiliarybattery to the vehicle computing system.